Cprporation



H. F. KRANTZ. SAFETY PANEL B0X-v v APPLICATION msn APR. 1|. |911.

PatntedY June .10, 1919.

2 SHEETS-SHEET I H.v F.4 KRANTZ. SAFETY PANEL Box. APPLICATION FILEDAPR. Il. 1911 Patented June 10, 1919.

N M www QW y WS the operator.

To aZZ'wLom-z't mayconcern: Y n Be it known that I, HUBERT F.v IiiAN'rz,"i residing at Brooklyn, in the county of Kings and StateofNew York,have invented certain'new and useful Improvements in SafetyvPan'el-Boxes, of which the following is a specification.- `Thisinvention relates to a safety shutter adapted for use particularly7 inconnection 10 vvitlipanel/ boxes and the like, the present` app-liefionbeing directed to ashutter ar- A rangement which is anV improvementover i l thesliutter arrangement shown in my pend ing application SerialNo; 85,852.

'.[liejobj ectj of the present improvement Lis tonproyidea moreuniformly effective, and au" niorefpractical, arrangement of parts. IAlmere specilic ob] ect is to provide means whereby to'insure the properassembly of A:e0 parts of the device at any and all times,

either :during ymanufacture or thereafter.

Morezspecilicallyfstated, an object of the Q invention is'fto provide ashutter for, safety panel( bones iir'vvliich, when 'the guard meml bfer,1jojr dooii,`lofthevrpanel box .is being assemblec witlrtl'ie bodyofthe panel box, the shutter 'will' be automatically broughtV intoproper.assernb-ly.v Withfthe door so that the shutter! will operativelyconnected with the'doorwitliout necessity for the taking of anyprecautions to this end on the part of ,Aj further objectis to provideashutter whichwill standl in'shielding position in ase thefdoorfisdisassembled for any reason. .Qther objects and Aaims of the invention,

, i more or lessspeciic than thosereferred to above, will be in partobvious and in part pointed outin thecourse of the following 40'descriptionfofthe elements, combinations, arrangements of partsanda'pplicationsy of principles, constituting the invention; 'and thescope ofJprotection `contei'nplatedlwill indicatedinftgheappendedclaims.

46 .11n thelaccompanying.:drawings 'whiclifare y" to be. talenzlas alpart fot this 'specifi'c'ati'on,

and. idwhich-l ha ,Sjshowli `fibel?elly i ferred forniQtembodiment?'oftli tom l0 I Tigure l A through'a panelpbox havinga-"fshutterfarranged therein. accordancenwith `this vention.

Fig. 2 is a vertical transverse view taken i i i ijf'sii'rn'ijraimitaox! Q I, of Lietteigsjlatent. Patente 'Appucatin nieuApri1`11, 1917. serial No. 161,354. e

a vertier sacaban -j View e,

substantially upon the plane of line II+-II u of Fig. 1, the switchmechanismbeing omitted for the sake of clearness. v

Fig. 3- is aview similarto that shown in Fig. 1, but illustrating theposition of the partswith the guard door disassembled and in the processof being assen'ibled, and

Fig.v 4 is a detailed perspective View of fthe shutter.

Referring to the drawings for ldescribing in detail the structure whichisv shown therein, the reference character-'L indicates 'the panel box.This hasj'au opening in its upper wall closedby a guard door'l.` A mainline lcontact member 2 is arranged withinthe b oX near one end, and abranch line contact 3 70 adjacentthe opposite end. A switch blade G isprovided Yforclosing.circuit between these contact members', and asuitable switch mechanism l'is 'provided for operating the switch bladefrom a position shown infull lines in Fig. 1 to a position shown'byfthelight `dotted lines, .or viceversa. The switch mechanism 1-,` and theswitch blade is preferably, though not necessarily, carried by andmovable with the door. fA 80 switch operating handle 5 is -provided-b7means of which the mechanism '4 may-'be op'- erated for manuallycontrollingl theswitch movements. When the door is closed, no access isprovided to the interior of the boX and the switch mechanism may bemoved at will by means of the handle 5 foropening and closing circuitbetween the contactsQ and 3. Vhen thedoor is opened, the "switchmechanism is moved to thevposition shown bythe heavy dotted linesshownin Fig. v1, so as to be entirely free of the contacts 2 and 3, andso as to be easily accessible for repairs, or 'for otherpurposes.l f 'i'f- ,.'Y

:'S'ncethemai'n line contact :2 isfrequently 95 d",',jit. isdldes ableithat ctedvvhen hegdzoo' 'entanvpseifawrffom f g into'enga-geinentthereivitli v as shown in Fig. 3, the spring 11 will holdobstruction.

When the door is closed, the lug 7 bears upon the lower surfacPportie...V 10 of the runway 8 and holds the shutter open so that theswitch blade is free to operate-without A spring 11 is provided forurging the shutter upwardly at all times.

lNhen the door .is swung open, the lug moves forwardly along thevsurface 10 toward the pivot 9, and as 'the door continues to swing, thelug, assisted by the spring, swings the shutter upwardly into the heavydotted position so thatthe free edge 12 of the shutter engages against atransverse barrier 13-which is fixed within the box in a position toguard the contact 2 at -all times.

Engagement ofthe edge 12 against the barrier 13 arrests movement both ofthe barrier and of the door.

The shutter while in this position completes a solid wall transverselywithin the nox, entirely shutting oif access to the contact 2 from theopening left by -tl movement of the door.

It will be noted that the spring 11 incidentally serves as a means forresiliently retaining the door in an open position. The

snap-catch 14, which it will be seen engages within a notch 15 of thebracket 6 when the door is swung open, may for this reason be dispensedwith in some instances. When the door is again closed, the lug 7 pressesagainst the surface 10 and, overcoming the spring 11, moves the' shutterdownwardly into its original position.

In the event that the door is disassembled,

the shutter in shielding position. "When the door is moved to bring thecenters 16 and 17 thereof into alinement for assemblin the door with thebody of the box, the lug 7, will engage against an upper surfaceportion. 18

ofthe shutter 'and will force the shutter, downwardly againstv thetension of the spring 411, the lug 7 meanwhiletraveling toward the outerend of the surface 18. As

Athe parts 16' and 17 are brought nearer together, the lug 7 will snapolf of the outer end of the surface 18 and will engage against Y. thesurface l10 in the position sliown by full lines in Fig. 1.

After the partsl and 17 have been propl erly connected, any swingingmovement of tively under-surface 19, against which the lug 7 may engageto move the shutter positively into full screening position in the eventof the spring l11 becoming weakened from any cause.

"The precise mechanical details of con some instances.

kshown in Fig. 4: so as to provide the runway 8 and the coperativesurfaces 10, 18 and 19, above described.

It will :be apparent that the shutter may be wider than illustrated, ifdesired, so that` the transverse barrier 13 may be omitted in Thepresence of this barrier, however, is of advantage in` that it is f apositively fixed element in a close guarding position relatively to thecontact 2. The contact 2 is preferably carried onthe underside of aninsulating block 23, and the barrier 13 is supported at the forward edgeof this block by meansv of one or more brackets 24 engaging the block 23and the barrier, substantially in the manner illustrated.

There may obviously be any number of contacts 2 or any number of switchmechanisms or switch blades transversely 0f the 95 box, without alteringthe description above f given. In Fig. 2, two of the contact; 2 areillustrated.

As' many changes could be made in this construction with departing fromthe scope 100 of the following claims, lit is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrative only and not in a limiting sense.Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is: l

1. The combination with a panel box or the. like having a guard membermovable 110 into and out of/guarding position, of a shutter arrangedwithin the box for shielding a certain element Within the box when theguardgmember is in non-guarding position, i

v and means normally urging the shutterito 116 -shielding position. I 2.Thecombination with a anel box or the like having a guard mem er movableinto and out of guarding position, of a shutter arranged within the boxfor shielding a 120 certainv element within the box when the guardmember is in non-guarding position, and a spring engaged between theshutter and a portion of the box to constantly urge the shutter intoshielding position.

3. The combination with a panel box or the like having a guard membermovable intoand out of guarding position, of a shutter arranged withinthe box for shielding a certain element within the box when the guardmember is in non-guarding position, and means to serve the doublepurpose of urging the shutter i'nto shielding position and of urging theguard member to nonguarding position. v

4. The'combination with avp'anelbox or the like having a guard membermovable into `and out ofv guarding position, of a shutter arran edwithin the box for shielding a cer- Y the like having a guard. member,movable '-2011 into and out of guarding position, of a shutter arrangedwithin the box for shielding a certain Ielement within the box when theguard member is in non-guarding position, a part carried by the guardmember for` op eratin the shutter, and means whereby said part willautomatically move into proper cooperative vrelation with the shutterwhen the guard member is being assembled with the remainder of the boxstructure.

6. The combi-nation with a panel box or the like having a guard membermovable into and out of guarding position, of a shuty ter arrangedwithin the box for shielding a certain element within the box when theguard member is in non-guarding position,

- a lu carried by the guard member for op'- eratlng the shutter, the-shuttcr/having.a runway `formed. therein to .receive said lug, and therunWaybeingopen-ended and having one Wall extended beyond another wal]to facilitate the automatic introduction of' the lug into the runwaycoincident with the assembly ofthe guard member with the re mainingelements of the box.

7; The combination with -a anal um 0rthe like having a guard mem ernormally 'closing an openin into the panel -box and said guard member inremovably mounted upon the panel box, 0% a shutter arranged within thepanel -box movable into and out bf position shielding a certain elementwithin the panel box, and means adapted to retain the shutter inshielding position in the event of removal of said guard member.

8. The combination with a panel box or the like having'a guard memberconnected therewith adapted to move into and out of position closing) anopening in the panel box, a Shutter mova ly mounted within the panelbox, connections whereby movement of the guard. member into open andclosed positions will move the shutter into shielding -and non-shieldingpositions, .said guard member being removably mounted upon the panelbox, and means to retain the shutter in shielding position in the. eventof removal of the guard member.

9. The combination vwith a panel box or vthe like having a guard membernormally closing an opening into the panel box -and said guard memberbeing removably mounted vupon the panelybox, of a contact HUBERT F.KRANTZ.

Witnesses:

GEO. W. 'Ecxnnsom JOHN L. KoLLE.

